Shiva Purana
मार्कण्डेयपुराणं हि तदाख्यातं च सप्तमम् ॥ अग्नियोगात्तदाग्नेयं भविष्योक्तेर्भविष्यकम् ॥ १३१ ॥
The seventh Purana is also described in the Markandeya Purana. From the combination of fire that fire is the future of the future statement.
english translation
mArkaNDeyapurANaM hi tadAkhyAtaM ca saptamam ॥ agniyogAttadAgneyaM bhaviSyokterbhaviSyakam ॥ 131 ॥
hk transliteration by Sanscript